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NEET Practice Questions (MCQs) with Answers & Solutions

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NEET 2023

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A very long conducting wire is bent in a semi-circular shape from $A$ to $B$ as shown in figure. The magnetic field at point $P$ for steady current configuration is given by:

A. $\dfrac{\mu_0 i}{4R}$ pointed into the page B. $\dfrac{\mu_0 i}{4R}$ pointed away from the page C. $\dfrac{\mu_0 i}{4R}\!\left[1 - \dfrac{2}{\pi}\right]$ pointed away from page D. $\dfrac{\mu_0 i}{4R}\!\left[1 - \dfrac{2}{\pi}\right]$ pointed into the page

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Explanation

Semicircle: $\mu_0 i/(4R)$ out of page. Two semi-infinite straight portions: each $\mu_0 i/(4\pi R)$ into page, total $\mu_0 i/(2\pi R)$. Net $= (\mu_0 i/4R)(1 - 2/\pi)$, out of page.

NEET 2023

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The resistance of platinum wire at $0^\circ$C is $2\ \Omega$ and $6.8\ \Omega$ at $80^\circ$C. The temperature coefficient of resistance of the wire is:

A. $3\times 10^{-4}\ ^\circ\text{C}^{-1}$ B. $3\times 10^{-3}\ ^\circ\text{C}^{-1}$ C. $3\times 10^{-2}\ ^\circ\text{C}^{-1}$ D. $3\times 10^{-1}\ ^\circ\text{C}^{-1}$

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Explanation

$R_t = R_0(1+\alpha t)\Rightarrow 6.8 = 2(1+80\alpha)\Rightarrow \alpha = 0.03 = 3\times 10^{-2}\ ^\circ\text{C}^{-1}$.

NEET 2023

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10 resistors, each of resistance $R$ are connected in series to a battery of emf $E$ and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased $n$ times. The value of $n$ is:

A. 10 B. 100 C. 1 D. 1000

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Explanation

Series: $I_s = E/(10R)$. Parallel: $I_p = E/(R/10) = 10E/R$. $n = I_p/I_s = 100$.

NEET 2023

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The radius of inner most orbit of hydrogen atom is $5.3\times 10^{-11}\ \text{m}$. What is the radius of third allowed orbit of hydrogen atom?

A. 0.53 Å B. 1.06 Å C. 1.59 Å D. 4.77 Å

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Explanation

$r_n = n^2 r_1$; $r_3 = 9\times 0.53 = 4.77$ Å.

NEET 2023

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A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically upwards with a velocity $4\ \text{m s}^{-1}$. The ball strikes the water surface after $4\ \text{s}$. The height of bridge above water surface is (Take $g = 10\ \text{m s}^{-2}$):

A. 56 m B. 60 m C. 64 m D. 68 m

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Explanation

Taking up positive from bridge: $-h = ut - \tfrac{1}{2}gt^2 = 4(4) - \tfrac{1}{2}(10)(16) = 16 - 80 = -64$, so $h = 64$ m.

NEET 2023

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The relation between $n_m$ ($n_m$ = the number of permissible values of magnetic quantum number $m$) for a given value of azimuthal quantum number ($l$), is:

A. $l = \dfrac{n_m - 1}{2}$ B. $l = 2n_m + 1$ C. $n_m = 2l^2 + 1$ D. $n_m = l + 2$

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Explanation

$n_m = 2l + 1\Rightarrow l = (n_m - 1)/2$.

NEET 2023

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The element expected to form largest ion to achieve the nearest noble gas configuration is:

A. O B. F C. N D. Na

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Explanation

N gains 3 electrons to give $N^{3-}$ (isoelectronic with Ne) — largest among the listed ions because of greatest electron-electron repulsion / lowest $Z_{eff}$.

NEET 2023

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Which amongst the following molecules on polymerization produces neoprene?

A. $\text{H}_2\text{C}=\text{CH}-\text{CH}=\text{CH}_2$ (1,3-butadiene) B. $\text{H}_2\text{C}=\text{C(Cl)}-\text{CH}=\text{CH}_2$ (2-chloro-1,3-butadiene) C. $\text{H}_2\text{C}=\text{CH}-\text{C}\equiv\text{CH}$ (vinyl acetylene) D. $\text{H}_2\text{C}=\text{C(CH}_3)-\text{CH}=\text{CH}_2$ (isoprene)

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Explanation

Neoprene = poly(chloroprene); chloroprene is 2-chloro-1,3-butadiene.

NEET 2023

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Identify the product in the following reaction:

A.
Phenol B.
Benzene C.
C₆H₅–MgBr D.
p-Bromophenol

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Explanation

Sandmeyer with Cu₂Br₂/HBr gives bromobenzene; Mg/dry ether forms PhMgBr; H₂O protonates Grignard → benzene.

NEET 2023

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The conductivity of centimolar solution of KCl at $25^\circ$C is $0.0210\ \text{ohm}^{-1}\,\text{cm}^{-1}$ and the resistance of the cell containing the solution at $25^\circ$C is $60\ \text{ohm}$. The value of cell constant is:

A. $1.34\ \text{cm}^{-1}$ B. $3.28\ \text{cm}^{-1}$ C. $1.26\ \text{cm}^{-1}$ D. $3.34\ \text{cm}^{-1}$

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Explanation

Cell constant $= \kappa\cdot R = 0.0210 \times 60 = 1.26\ \text{cm}^{-1}$.

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